【单选题】(eBay,2019)以美国站为例,共有几个等级的店铺可以购买? ()
【单选题】Many ads at agers, and some young people see more than 100 advertisements a day. [ ]
B.
aimed special terrible
【多选题】下列关于非概率抽样的缺点的描述中,正确的有()。
B.
为了对总体进行推断,需要对样本的代表性作很强的假定,而这样的假定通常有很大的风险
C.
由于不是严格按随机抽样原则来抽取样本,因而不能从数量上推断总体
【单选题】下列选项中,不属于非概率抽样的是( )。
【简答题】People living more than three thousand meters above sea level find it difficult to raise vegetables all year long. People living in the highlands of Peru and Bolivia, for example, cannot grow vegetabl...
【简答题】阅读1:A new study suggests that contrary to most surveys, people are actually more stressed at home than at workA new study suggests that contrary to most surveys, people are actually more stressed at h...
【判断题】在三面投影体系中,主视图,俯视图,左视图之间保持长对正,高平齐,宽相等的原则(相关知识)
【单选题】实施非统计变量抽样时,如对总体进行了分层,下列说法中,不正确的是( )。